Yarn-tensioning device



Nov. 8,v 1927.

` M. PIGEON YARN TENSIONING DEVICE Filed Dec. 19. 1923 JNVENTOR:

/una M. Pvlgeqz@ En@ ATToRNE.

. ALBERT'M. Menon, `nnen-asian, LATE 0F Nonnismown, PENNSYLVANIA, BY vAmun M. PIG-EON, ADMINISTRATRIX, OF NORRISTOWN, PENNSYLVANIA.

Y YARN-TENSIONING DEVICE.-

appncation filed December 19, i923. serial No. ,631,573f i This invention relates to` yarn tensioning devices for textile machinery, and its principal object is to provide a means adapted to yield automatically in response to variations in pull impressed upon the yarn so as to sustain the yarn under uniform tension at all times; in combination with a stabilizingy l means controlling operation of the drag imtening 12.

pressing means, so as to retardresponsive vibrations of the latter, wherebyto aidfin the production of a smooth even fabric:

In addition tothe foregoing, this invention comprehends improvements in the details of construction and arrangement of the correlated parts toy be hereinafter set forth and particularly pointed out by the appended clai`ms. Y l

In the accompanying drawings, Fig.- I is a view intop plan ofa yarn tension device constructed in accordance with thisinvention; i

Fig. His elevation; and, Fig. III is a view a. view of thedevice in front thereof in vertical section takenv on the line IIIf-Hl .of vWith reference to the drawings, 10j indicates a horizontal frame bar havinganupwardl'ydirected extension' 11 by which the tension l,device may be supported from the frame of a fabric producing or sewing machine through the medium of a threaded fas- A series of lcircumferentially giooved elements, 13 aic fixedlysecuredto one face of theframe bar 10 throughthe medium of screws 14, forming stationary yarn engaging elements for a purpose to be presently noted. Y

Arpair of-arms 15 forming part of the frame barl() are directed Vlaterally to afford journal l support for the ends of a shaft 16.

`The journalling of the shaft` 16 is eected through` the medium of pivot screws 17 which are adjustably supported in the ends of' the ,arms 15, thesciews being formed' with pointed terminals 18, which enter correspondingly shaped recesses in the ends of the shaft 16 toy afford fi'ictionless bearings for the latter. rihe pivot screws 17 are fixed in adjusted position, by means of jamb nuts 19 threaded.

upon the same. Extending radially and horizontally from the shaft 16 and rigidly affixed thereto Vare afsei'ies of arms 20, each arm being positioned betweenvan adJacent pair of the aforesaid grooved yarn engaging elements 13, and one beyond each eridwelement of saidseries. The terminalsfof the armsv 20 are preferably looped to enclose yarn of a smooth, hard, `wea-r resistant material such as porcelain.y The frame bar'l()` is formed with a depending extension 22 to the lower end of which there is pivotally oon,-

engaging elements in the form of eyelets 21 .l

neet-ed the piston member 23 of a stabilizing or'retarding device of they dash-potl type. This' piston member 23 cooperates with the cylinder 2,4 of the dash-pot whose upper ter? sition,"by means of a `set screw 29 entering the-same and adapted to engage the lever 27. rl constant Vdrag-inipressing instrumentality is provided in the formlof la strand of wire f3() secured "atene end to y'thefextension 22 and bent toforin a series of undulationsl terminating in a loop which is.V designedto retain a guide eyelet 82. The yarn indicated aty 33,-. in coini'ng from' the'source of supply,

passes throughthe stationary eyelet 32, then back and forth 4in and vaboutthe undulations i 31, then fromle'ft to right through the1sevi g elements incidentally Vengaging the nether portions of the interposed fixed yarn-S engaging elements 13, and aftervleaving the last of the eyelets -21 passes Adirectly-to the fabric producing means or sewing mechanism of the textile machin-e@ It will Vbe apparent that during .operation of the 'i'nac-hine, ayslnggishly responsive drag is impressed upon the yarn 33 by virtue of the countei'weight 2 8, the influence whereof 'is exerted upon the extremities of the arms V2O, thereby urging the Vlatter yupward and causing the yarn 33 to pass between the ene gaging elements 13`ina constant-ly reverseral eyeletsV 21 ofthe movable yarnengag-y ing path. Hence, any variation in the linear traveling speed of the yarn 38 will .effect veri tical oscillation of thel movable yarn engaging eleyets 21, yielding to downward movement'asthe pull on `the yarn 33 or rate of travel'is increased and taking up said l. `yarn as the rateoftravel or amount ofrpull thereon decreases. 'It is desirable that such changes in the vpull or rate of' travel be rev spond'ed to vslowly and not abruptly,in order rthat the result-ant Vproduct or fabric'of the" ymachine vkmay be uniform and smoothxin'i allits parts'. To this end,the stabilizingdevice Ycompreliendediby the members 23 and 2st is provided to control vertical oscillation of the movable yarnengaging elements 207,* V'21,fthisfaction being occasioned bylreasono` y the "air"Wliicligis'conined rWithin the cylinder i iiuenceof thed'ashQpot[deviceliencefcauses l y 24,; and Wliiclifcan lonly eifectan exitrvvhen fthe cylinder space yis'decreasedfby flowing outward aroundtlie sides of the pist`on23,

and: Conversely by V'perinitting air to enter said V'Cylinder inthe same manner When 'replacer` ment oceurs'lwithin the cylinder, by'reason of the. outward @movement of the piston V23 c during upward travel Vorf-the j'inov-able; yarn engagingfelements' 211 The retarding lintlie movable elements v20,121V to respond in Y* 'ajveryY sluggish :manner tovibrations imv during its'pas'sage 'Byl'sliiftingthe counter: 1 .vvveight285 along its support,v the device may [L beadjusted to jprovidev'a compensating drag ferm Ito any f Condit-ions depending uponL 'the character .of the .machine 'With'Wliich the device is Atofbe used, 'or the. ,na't'ure`ot` Vtlietvork produced.:- Thus theesame device may used. tor either 'silla' [Woolforicottoii yarns,

oryarns fof 'various'"qualities7` 'by properly adjusting the cnfint'ervveight'tensiongf"gV It [has `been found 'in practice that` asa l result ofth'e'use of the stabilizingdevice employefd in connection with this invention,k the tensionl isunii'ormlyLin'aintainedwitli ,theel iesult--that smooth even iabricV 's'produced landyvvlien thev device isV used,V 'for instance, on.

` a lnittingj machinethe needlesbare heldin tension, thereby preventing Y' A formation off looseand tight stitches. Owing to itssim-L 'vplicty ofgrconstructi'on," this-*improved tension device is not' open to the objection of other yvieil known retarding devices ymay bei Y.

`found equally suitable and convenient. n*

vHaving thus describedthe invention, what 1; Ina yarn tensioningdevice comprising` a stationary frame member With'ia group of e i 60 yelementsV and means exerting constant dragv spacedly aligned stationary yarn engaging upon tlie'yain, the combination of aco-operating movable' member including a shaft journaled in the'rame-member and having v a series oi projecting"yarny engaging Vele-y ments swingable in the' intervalslbetvvee'ntheiv stationary" elements aforesaid, an .adj ustabl'e couiiteryveight adapted to .i partially: balance tiie yarn engaging elements' and for imparti' t c I Y* y ingfcompensative drag, and a .pneumatic stabilizer embodying a-fstatio"naryandl a mov-f able member respectively pivot'ed to a de-V pending extension oi the :trame member Vand tooiie of the movable'yarnsengagingv elementsv atoresaid,V 'said stabilizer Vfunctioning tofi'ender sluggish responsive movements-to said movable 'members incident to spasmodie variations inthe pull upon the fya'iii.V

" 2K. The combination in ayarnk tensioning :device of a stationary frame member haii/' ing algi'oup or spacedly'aligned stationary yarn engaging elementsfan undulatedmember exerting a 'constant drag -upon the yarn,

a movable member .including fa shaft jour-A naled in the rameinember and liavinggafie series of projectingyaln engaging elements! 'Y swingable lin the `intervals"betweengtliev stationary Velementsrfaforesaid an'V adjustable Y' Y countei'weiglitfadapted to partially'balar'ice*i eej the yarn vengaging elements'l'ior, imparting compensative drag', yand a "pneumatic'sta-V bilize'r embodying a :stationaryfand amov# ablememberrespectively pivotedto-af dei y Y pendingv extensionoi'jtlie trame member and, l I

to 'an extensioiio'r" one of the movable yarn engaging members aforesaid, said stabilizer V"functioning to render ,sluggishl responsive l movements to tlie'movable members 'incident' l:to spasmodicva'riations in the pulluponftheV in' testimony vvvhereo Ilia've hereunto,

yarn.

signed my name at 409Chestn1it St., Phila., this"v thirteenth day of Decemben V1923.` Y

Deemed e t I ANNA M. Pierson; j Adm-aisltmtrz' fof the" Estate of lAlbert My e 

